As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MBJ - FL 1888 - FLIGHT RETURNED TO FIELD AT MBJ DUE TO SMOKE IN THE CABIN. CREW FOUND THE NR 2 TRANSFORMER RECTIFIER HAD FAILED AND THE CIRCUIT BREAKER WAS POPPED. FLIGHT LANDED WITHOUT FURTHER INCIDENT. NO EMERGENCY WAS DECLARED. MAINTENANCE REMOVED AND REPLACED THE NR 2 TRANSFORMER RECTIFIER UNIT AND THE R4 TRANSFER RELAY. OPS CHECK GOOD. REFERENCE USAASB97199.